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VOCs released from municipal solid waste at the initial decomposition stage: Emission characteristics and an odor impact assessment

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Journal of Environmental Sciences 2020年第12期32卷 143-150页

作者： Yanjun Liu Huiyuan Yang Wenjing Lu School of Chemical&Environmental Engineering China University of Mining&TechnologyBeijing 100083China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Environment Tsinghua UniversityBeijing 100084China

The nuisance from odor caused by municipal solid waste(MSW) is resulting in a growing number of public complaints and concerns. Odor pollution occurs in the initial decomposition stage of MSW, including waste collection, transportation and early pre-treatment. Furthermore, decomposition takes place in waste facilities that are often close to living areas, which can result in odor impacts on local inhabitants. However, this aspect of odor impact from MSW has not been well studied. In the current study, lab-scale waste cells were designed to simulate MSW storage conditions in the early stage. The characteristics of VOCs emissions with different waste compositions were analyzed. The odor concentration( CO, non-dimensional) method and odor intensity were used for the assessment of odor. Ethanol was the substance with highest emission rate. The release rate of VOCs increased with the growth easily biodegradable waste(EBW). VOCs emissions was reduced by 25% when the proportion of EBW decreased from 60% to 45%. Methyl sulfide, ethanol, dimethyl disulfide and ethyl acetate were identified as typical odorants. The EBW proportion in waste is the main factor significantly influencing odor pollution. The CO was 244.51 for the 60% EBW condition, which was only 61.46 for 15% EBW condition. These study results provide important information for the implementation of a garbage sorting policy and the monitoring of odor pollution from waste management.

关键词： Municipal solid waste(MSW) Initial decomposition stage Volatile organic compounds(VOCs) Odor impact assessment Odor concentration(CO)

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RIS-Aided Constant-Envelope Beamforming for Multiuser Wireless Power Transfer:A Max-Min Approach

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China Communications 2021年第3期18卷 80-90页

作者： Huiyuan Yang Chang Cai Xiaojun Yuan Yingchang Liang Center for Intelligent Networking and Communications University of Electronic Science and Technology of ChinaChengdu 611731China

As a revolutionary hardware technology that can reconfigure the propagation environment,reconfigurable intelligent surfaces(RISs)have been regarded as a promising solution to enhance wireless networks.In this paper,we consider a multiuser multiple-input single-output(MISO)wireless power transfer(WPT)system,which is assisted by several RISs.In order to improve energy efficiency and reduce hardware cost,we consider that the energy transmitter(ET)in the WPT system is equipped with a constant-envelope analog beamformer,instead of a digital beamformer.Focusing on user fairness,we study a minimum received power maximization problem by jointly optimizing the ET beamforming and the RIS phase shifts,subject to the constant-envelope constraints.We iteratively solve this non-convex maxmin problem by leveraging both the successive convex approximation(SCA)method and the alternating direction method of multipliers(ADMM)algorithm.Numerical results demonstrate the effectiveness of the proposed algorithm and show attractive performance gain brought by RISs.

关键词： reconfigurable intelligent surface wireless power transfer max-min fairness constantenvelope beamforming

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Digital/Analog Simulation Platform for Distributed Power Flow Controller Based on ADPSS and dSPACE

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 181-189页

作者： Aihong Tang Zhijian Lu Huiyuan Yang Xinpeng Zou Yong Huang Xu Zheng the School of Automation Wuhan University of TechnologyWuhan 430070Hubei ProvinceChina the State Grid Hubei Economic&Technology Research Institute Wuhan 430077Hubei ProvinceChina

Distributed power flow controller,which is among the most powerful distributed flexible transmission equipments,is still only in the stage of the oretical research and digital simulation.In order to promote the engineering demonstration of a distributed power flow controller,it is urgent to establish a digital/analog simulation platform that supports closed-loop real-time simulation of a distributed power flow controller.In this paper,the electromagnetic transient model of a distributed power flow controller is established on ADPSS(advanced digital power system simulator).The rapid control prototype realized by dSPACE is connected to ADPSS to form a digital/analog simulation platform for a distributed power flow controller.Through a voltage control and power flow control simulation of the test system with a distributed power flow controller,the correctness and effectiveness of the constructed simulation platform are verified,which provides a new way for the verification of the new theory of a distributed power flow controller.

关键词： ADPSS digital/analog simulation platform distributed power flow controller dSPACE rapid control prototype

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Reconfigurable Intelligent Surface Assisted D2D Underlay Communications:A Two-Timescale Optimization Design

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Journal of Communications and Information Networks 2020年第4期5卷 369-380页

作者： Chang Cai Huiyuan Yang Xiaojun Yuan Ying-Jun Angela Zhang Yi Liu Center for Intelligent Networking and Communications(CINC) University of Electronic Science and Technology of China(UESTC)Chengdu 611731China Department of Information Engineering The Chinese University of Hong KongHong Kong 999077China

The performance of a device-to-device(D2D)underlay communication system is limited by the co-channel interference between cellular users(CUs)and D2D devices.To address this challenge,a reconfigurable intelligent surface(RIS)aided D2D underlay system is studied in this paper.A two-timescale optimization scheme is proposed to reduce the required channel training and feedback overhead,where transmit beamforming at the base station(BS)and power control at the D2D transmitters are adapted to instantaneous effective channel state information(CSI);and the RIS phase shifts are adapted to slow-varying channel mean.Based on the two-timescale optimization scheme,we aim to maximize the D2D ergodic weighted sum-rate(WSR)subject to a given outage probability constrained signal-to-interference-plus-noise ratio(SINR)target for each CU.The two-timescale problem is decoupled into two sub-problems,and the two sub-problems are solved iteratively.Numerical results verified that the two-timescale based optimization performs better than two baselines,and also demonstrated a favourable trade-off between system performance and CSI overhead.

关键词： reconfigurable intelligent surface(RIS) device-to-device(D2D)underlay communication twotimescale optimization

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Theory,technology and application of grouted bolting in soft rock roadways of deep coal mines

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1463-1479页

作者： Hongpu Kang Jianwei yang Pengfei Jiang Fuqiang Gao Wenzhou Li Jiafeng Li huiyuan Chen Coal Mining Research Institute China Coal Technology and Engineering Group Co.Ltd.Beijing 100013China Coal Mining Branch China Coal Research InstituteBeijing 100013China State Key Laboratory of Intelligent Mining and Strata Control Beijing 100013China

The grouted bolt,combining rock bolting with grouting techniques,provides an effective solution for controlling the surrounding rock in deep soft rock and fractured roadways.It has been extensively applied in numerous deep mining areas characterized by soft rock roadways,where it has demonstrated remarkable control results.This article systematically explores the evolution of grouted bolting,covering its theoretical foundations,design methods,materials,construction processes,monitoring measures,and methods for assessing its effectiveness.The overview encompassed several key elements,delving into anchoring theory and grouting reinforcement theory.The new principle of high pretensioned high-pressure splitting grouted bolting collaborative active control is introduced.A fresh method for dynamic information design is also highlighted.The discussion touches on both conventional grouting rock bolts and cable bolts,as well as innovative grouted rock bolts and cables characterized by their high pretension,strength,and sealing hole pressure.An examination of the merits and demerits of standard inorganic and organic grouting materials versus the new inorganic–organic composite materials,including their specific application conditions,was conducted.Additionally,the article presents various methods and instruments to assess the support effect of grouting rock bolts,cable bolts,and grouting reinforcement.Furthermore,it provides a foundation for understanding the factors influencing decisions on grouted bolting timing,the sequence of grouting,the pressure applied,the volume of grout used,and the strategic arrangement of grouted rock bolts and cable bolts.The application of the high pretensioned high-pressure splitting grouted bolting collaborative control technology in a typical kilometer-deep soft rock mine in China—the soft coal seam and soft rock roadway in the Kouzidong coal mine,Huainan coal mining area,was introduced.Finally,the existing problems in grouted bolting control technology for deep soft rock roadways are analy

关键词： deep coal mine soft rock roadway grouted bolting rock bolt and cable grouting material high-pressure splitting grouting collaborative control technology

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A biomimetic nanocomposite with enzyme-like activities and CXCR4 antagonism efficiently enhances the therapeutic efficacy of acute myeloid leukemia

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Bioactive Materials 2022年第12期7卷 526-538页

作者： Fei Kong Hongliang He huiyuan Bai Fang yang Ming Ma Ning Gu Yu Zhang State Key Laboratory of Bioelectronics Jiangsu Key Laboratory for Biomaterials and DevicesSchool of Biological Science and Medical Engineering&Collaborative Innovation Center of Suzhou Nano Science and TechnologySoutheast UniversityNanjing210096PR China

Despite the progress made to improve therapeutic outcomes for acute myeloid leukemia(AML),many unmet clinical needs remain to be resolved.Unlike existing anti-AML strategies,here we developed a biomimetic nanocomposite to efficiently eliminate the leukemia cells in the bone marrow and prevent the homing of AML.To fulfill our design,the ultra-small nanozyme was conjugated onto the surface of an oxygen-carrying nanoparticle,which was further coated with bone marrow stromal cell membrane.After entering the blood,this biomimetic nanocomposite got actively internalized by the leukemia cells in the blood and released the loaded chemotherapeutics and nanozyme inside the leukemia cells to achieve a synergistic antitumor efficacy.Meanwhile,the adhesive properties of the stromal cell membrane enabled the nanocomposite to home to the bone marrow,where the nanocomposite effectively killed the retained leukemia cells.More importantly,the biomimetic cell membrane also acted as a CXCR4 antagonism to block the CXCR4/CXCL12-mediated homing of leukemia cells to the bone marrow and infiltration to other organs like the liver and spleen.In conclusion,this proof-of-concept study demonstrated that our designed platform effectively kills leukemia cells while preventing their infiltration,thus providing a promising prospect for resolving the clinical challenges in current AML treatment.

关键词： Acute myeloid leukemia Biomimetic nanocomposite Nanozymes CXCR4/CXCL12 axis

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Research on the Crustal Velocity Model of the Yunnan Region and Its Application

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Earthquake Research in China 2018年第4期32卷 510-520页

作者： yang Jingqiong yang Zhousheng Zhang huiyuan Yunnan Earthquake Agency Kunming 650203China

This paper selects the records of 7,412 earthquakes,each recorded by more than 10 stations in Yunnan between 2009 and 2014 to acquire the traveltime curves.Meanwhile,for improving precision,linear analysis,reduced traveltime curve and interval stability analysis are conducted focusing on the records of 83 earthquakes with M_L≥3.0 recorded each by≥80%of the stations,and by combining predecessors'research results,the initial crustal velocity model of the study area is obtained.By selecting 200 earthquakes with M≥3.0 occurring in Yunnan between 2010 and 2014,using the Hyposat batch location processing method to iterate the initial velocity model,and performing fitting to S waves layered velocity structure,we obtain the crustal velocity model for the Yunnan region,namely,the 2015 Yunnan model,with:v_(P1)=6.01km/s,v_(P2)=6.60km/s,v_(Pn)=7.89km/s,H_1=20km,H_2=21km,v_(S1)=3.52km/s,v_(S2)=3.86km/s,v_(Sn)=4.43km/s.Analysis on earthquake relocations based on the new model shows that most earthquakes occurring in Yunnan are at a depth of 10km-20km of the upper crust.The March 10,2011 M_S5.8Yingjiang and August 3,2014 M_S6.5 Ludian earthquakes are relocated,and the focal depths determined with the new model are respectively close to the precise positioning result and hypocentral distance to the strong motion stations at the epicenters,indicating that the new one-dimensional velocity model can better reflect the average velocity structure of the study area.

关键词： The Yunnan area Crustal velocity model Earthquake location

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A rolled Mg-8Al-0.5Zn-0.8Ce alloy with high strength-ductility synergy via engineering high-density low angle boundaries

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Journal of Magnesium and Alloys 2022年第10期10卷 2889-2900页

作者： Xiao Ma Min Zha Siqing Wang Yi yang Hailong Jia Dan Gao Cheng Wang huiyuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityNo.5988 Renmin StreetChangchun 130025PR China State Key Laboratory of Super hard Materials Jilin UniversityChangchun130012PR China International Center of Future Science Jilin UniversityChangchun 130012PR China

Developing low-cost rolled Mg alloys with both high strength and ductility is desirable,while the improved strength is generally accompanied with decreased ductility.Here,by using rotated hard-plate rolling(RHPR)with a total thickness reduction of~85%,we obtained a Mg-8Al-0.5Zn-0.8Ce(wt.%,AZ80-0.8Ce)alloy with a high strength-ductility synergy,i.e.,the yield strength(YS),ultimate tensile strength(UTS)and elongation-to-failure(EF)are~308 MPa,~360 MPa and~13.8%,respectively.It reveals that the high YS is mainly originated from grain boundary strengthening(~212 MPa),followed by dislocation strengthening(~43 MPa)and precipitation hardening(~25 MPa).It is found that a relatively homogeneous fine grain structure containing a large fraction(~62%)of low angle boundaries(LABs)is achieved in the RHPRed alloy,which is benefit for the high tensile EF value.It demonstrates that LABs have important contributions to strengthening and homogenizing tensile deformation process,leading to the simultaneous high strength and high EF.Our work provides a new insight for fabrication of low-cost high performance Mg alloys with an excellent strength-ductility synergy.

关键词： Mg-Al-Zn alloys Rolling Strengthening mechanism Microstructure Strength-ductility synergy

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Hardening effect and precipitation evolution of an isothermal aged Mg-Sm based alloy

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Journal of Magnesium and Alloys 2023年第12期11卷 4619-4627页

作者： Kai Guan Chuang Li Zhizheng yang Yongsen Yu Qiang yang Wenwen Zhang Zhiping Guan Cheng Wang Min Zha huiyuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Jilin UniversityChangchun 130022China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Department of Energy and Hydrocarbon Chemistry Graduate School of EngineeringKyoto UniversityNishikyo-kuKyoto 615-8510Japan

The age-hardening behavior and precipitation evolution of an isothermal aged Mg-5Sm-0.6Zn-0.5Zr(wt.%) alloy have been systematically investigated by means of transmission electron microscopy(TEM) and atomic-resolution high-angle annular dark field scanning transmission electron microscopy(HAADF-STEM). The Vickers hardness of the present alloy increases first and then decreases with ageing time. The sample aged at 200 ℃ for 10 h exhibits a peak-hardness of 90.5 HV. In addition to the dominant β_(0)’ precipitate(orthorhombic,a = 0.642 nm, b = 3.336 nm and c = 0.521 nm) formed on {11-20}α planes, a certain number of γ’’ precipitate(hexagonal, a = 0.556 nm and c = 0.431 nm) formed on basal planes are also observed in the peak-aged alloy. Significantly, the basal γ’’ precipitate is more thermostable than prismatic β_(0)’ precipitate in the present alloy. β_(0)’ precipitates gradually coarsened and were even likely to transform into β_(1) phase(face centered cubic, a = 0.73 nm) with the increase of ageing time, which accordingly led to a gradual decrease in number density of precipitates and finally resulted in the decreased hardness and mechanical property in the over-aged alloys.

关键词： Magnesium alloys Ageing treatment Microstructure characterization Age-hardening effect Precipitates

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Studies on Hydrolysis Mechanism of Anticancer Ruthenium Drug ImH[trans-Ru（Im）2Cl4] via ABEEMσπ Polarizable Force Field Combined with QM and MD-FEP

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Chemical Research in Chinese Universities 2017年第2期33卷 239-247页

作者： Li, Hui Zou, huiyuan Liu, Linlin Zhao, Dongxia yang, Zhongzhi School of Chemistry and Chemical Engineering Liaoning Normal University Dalian P. R. China

We used ABEEMon（atom-bond electronegativity equalization method） polarizable force field（ABEEMσπ PFF） method combined with QM and molecular dynamics-free energy perturbation（MD-FEP） methods to investigatethe function of water molecules in hydrolysis process of ImH[trans-Ru（Im）2Cl4]（ICR）. The activation free energiesobtained via MD-FEP calculation are in fair agreement with the experimental data. In addition, QM/MM（ABEEM）rationally describes the charge distributions and the electrostatic interaction between molecules. ABEEMσπ fluctua-ting charge model has the following good characteristics：（1） not only atomic charge regions but also σ,π bond andlone pair charge regions are explicitly represented for a molecule; （2） the region charges are geometry dependent andcalculated from time to time in the dynamic simulation without any iterative procedure so that its performance istime-saving compared with the Drude model and induced dipole model.

关键词： Atom-bond electronegativity equalization method(ABEEMσπ) polarizable force field Quantum mecha-nics/molecular mechanics(QM/MM) Molecular dynamics-free energy perturbation Hydrolysis mechanism Activationfree energy

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